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Add displayDataFromPercentile option #95

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Dec 22, 2017
Merged

Add displayDataFromPercentile option #95

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11 changes: 9 additions & 2 deletions smoothie.js
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Original file line number Diff line number Diff line change
Expand Up @@ -293,6 +293,9 @@
* },
* tooltipFormatter: SmoothieChart.tooltipFormatter, // formatter function for tooltip text
* nonRealtimeData: false, // use time of latest data as current time
* displayDataFromPercentile: 1, // display not latest data, but data from the given percentile
* // useful when trying to see old data saved by setting a high value for maxDataSetLength
* // should be a value between 0 and 1
* responsive: false, // whether the chart should adapt to the size of the canvas
* limitFPS: 0 // maximum frame rate the chart will render at, in FPS (zero means no limit)
* }
Expand Down Expand Up @@ -340,6 +343,7 @@
scaleSmoothing: 0.125,
maxDataSetLength: 2,
scrollBackwards: false,
displayDataFromPercentile: 1,
grid: {
fillStyle: '#000000',
strokeStyle: '#777777',
Expand Down Expand Up @@ -626,14 +630,17 @@
// find the data point with the latest timestamp
var maxTimeStamp = this.seriesSet.reduce(function(max, series){
var dataSet = series.timeSeries.data;
var indexToCheck = Math.round(this.options.displayDataFromPercentile * dataSet.length) - 1;
indexToCheck = indexToCheck >= 0 ? indexToCheck : 0;
indexToCheck = indexToCheck <= dataSet.length -1 ? indexToCheck : dataSet.length -1;
if(dataSet && dataSet.length > 0)
{
// timestamp corresponds to element 0 of the data point
var lastDataTimeStamp = dataSet[dataSet.length-1][0];
var lastDataTimeStamp = dataSet[indexToCheck][0];
max = max > lastDataTimeStamp ? max : lastDataTimeStamp;
}
return max;
}, dateZero);
}.bind(this), dateZero);
// use the max timestamp as current time
this.render(this.canvas, maxTimeStamp > dateZero ? maxTimeStamp : null);
} else {
Expand Down